Falling Wireless Prices Make a T-Mobile Deal More Important—and More Difficult

There is no ignoring it: U.S. wireless prices are falling. That could throw up an extra hurdle for Sprint's deal-making ambitions.

The No. 3 U.S. wireless carrier by subscribers is considering whether to bid for No. 4 player T-Mobile US. But any deal would face intense scrutiny from regulators who laid out a preference for maintaining four national carriers when rejecting AT&T's bid for T-Mobile in 2011. A key factor in their...